The volume of users playing Call of Duty: Modern Warfare 2 via the PlayStation Network has caused game crippling problems for Sony and Activision.
The problem was with the PlayStation Network itself, according to Infinity Ward's Rob Bowling, who kept users up to date with the issue via Twitter last night.
"It's a server overload not a bug in the code," wrote Bowling. "They're working to have servers back up ASAP. MP servers gradually coming back online. Some users may still experience issues," he added.
"Looks like it was the amount of connections at once that killed PSN."
Users were let back on to the service gradually, as the temporary solution was found to get players back in the highly-popular game.
"They're enabling 20,000 users at a time to connect now. I believe this is Sony/DemonWare's temporary solution while they work on fortifying the infrastructure," he said.
At the time of writing, Bowling's last update on the problem said that "PSN multiplayer should be running at full capacity. We expect smooth skies ahead."